Five‐year Mortality in the City of Bergen, Norway, According to Age, Sex and Blood Pressure

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Abstract
The City of Bergen was covered by a Mass Miniature Radiology Survey in 1963-64; examinations of BP [blood pressure] were included. The initial survey was reported previously. This analysis concerns the relationship between the 5 1/4 yr cause-specific mortality and BP. Non-attenders have excess mortality in relation to attenders and this is mostly explained by a generally high mortality among bedridden people. The age-specific total mortality shows a clear pattern of a general increase with increasing BP. At high systolic BP levels, the 5 yr mortality is independent of whether the age is 45 or 75 yr. The systolic age-adjusted curve for males increases quite linearly, while the diastolic curve is more U-shaped. When comparing the predictive power of BP, allowance must be made for this fact. Using a 2nd order polynomial prediction function, diastolic BP seems somewhat better than the corresponding systolic BP for age-adjusted total mortality. Using a linear prediction function, this conclusion is reversed. The mortality from cerebral stroke shows a dramatic increase with increasing BP. The diastolic curve shows a bend-off for high values, above 110 mmHg. This may be due to the offer of treatment received by such patients after the screening. The CHD [coronary heart disease] mortality curve flattens for high BP values, especially for diastolic BP.

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